Vent valve for sewage ejectors



Aug. 4, 1931. 1. c. JENNINGS VENT VALVE FOR SEWAGE EJECTORS lOriginal Filed March '25, 1925 3 Sheets-Sheet l iezpenz jor 4, 1931. I. 0. JENNINGS 1,817,196

VENT VALVE F'OR SEWAGE EJECTORS v Original Filed Max-9h 25, 1925 3 Sheets-Sheet 2 v if l-i=: I 1 l H 1 IE i: 2.

Aug. 4, 1931. I. c. JENNINGS VENT VALVE FOR SEWAGE EJECTORS 3 Sheets-Sheet 5 \original iilsd March 25, 1925 M mg? Q 2 w Patented Aug. 4, 1931 PATENT OFFICE IRVING G. JENNINGS, OF SOUTH NORWALK, CONNECTICUT VENT VALVE FOR SEWAGE EJECTORS Original application filed March 25, 1925,

This application for patent is a division of an application for patent filed by me March 5, 1925, Serial Number 18,27 6, and is filed in pursuance of a Patent Office requirement.

The object of this invention is to provide a new and improved automatically operat ing vent'valve for sewage ejectors, particularly one that can be used in connection with the apparatus shown,'described and claimed in Letters Patent granted to me April 29, 1924:, No. 1,492,171.

In this patent, I have shown a sewage ejector of the air compresser type, in which the air under pressure is supplied by a rotary hydro-turbine air pump and through which .pump the air vents when the pump is cut out of operation.

I have encountered difiiculty in some loca tions in using the hydro-turbine air pump to compress the air and in allowing the air to vent through the pump, by reason of the fact that it is necessary to provide a water supply for the hydro-turbine pump so that it will always be in condition to operate.

The means I preferably employ for supplying the hydro-turbine pump with priming water consists of a small supply tank or receptacle towhich city water or other supply is connected, and in which a level just above the inlet to the pump is maintained by a; float controlled valve. If this valve should leak, there might be too much water in this supply tank, which, in some cases where the drains to the sewage ejector are almost at a level with the same, would choke the back flow of air through the pump.

IAnother difiiculty encountered was that when the water or sewage flowed into the ejector at a rapid rate, the air would flow back through the air pump so fast that when the pump was started in operation, the same was unable to get priming water quickly and unable to start into operation immediately. Under these conditions the pump might run for fifteen or twenty seconds or longer before it would start to compress the air, during which time the ejector would partly fill, which would increase the time required to dis-- charge the sewage from the ejector, and thus reduce its capacity.

Serial No. 18,276. Divided and this application filed November 25, 1927. Serial No. 235,629.

Theobject of the present invention is to overcome these difiiculties and keep the air pump properly primed.

The invention is illustrated in the accompanying three sheets of drawings, in which Figure 1 is a sectional diagrammatic elevation of the apparatus showing the same in operation ejecting the sewage;

Fig. 2 is a similar view showing the pump out of operation and the compressed air escaping from the ejector;

Fig. 3 is an enlarged sectional elevation of the vent valve;

F ig. 4 is a partial sectional elevation illustrating the valve in closed position;

Fig. 5 is a sectional elevation illustrating the valve in open position allowing the venting of the ejector;

Fig. (3 is a cross sectional plan on the line 6-6 of Fig. 4:, illustrating a part of the valve and Fig. 7 is a plan view of the operating piston of the valve.

Referring to the drawings and in detail, A designates the ejector or pot to which the sewage is led by an inlet pipe B, having a forwardly opening check valve, and from which the sewage is forced through an outlet pipe C also having a forwardly opening check valve. D designates the hydro-turbine air compresser, the outlet of which is connected by pipe E to the ejector A. A. float F is arranged in the ejector and operates a switch which controls the operation of an electric motor driv ing the pump. These parts are arranged substantially as described in my prior patent and operate briefly as follows:

When the sewage reaches a high level in the ejector, the float will throw the switch. so that the motor will start the pump in operation. The pump will force air into the top of the ejector and the sewage will be forced therefrom as illustrated in Fig. 1. lVhen the level of the sewage falls to a low determined point, the float operates the switch to stop the motor and throw the pump out of operation.

When the pump stops, the compressed air will flow out through the pipe E, and when the air pressure is relieved, the sewage will flow into the pot, as illustrated in Fig. 2, until or surge tank on the pump inlet to which a supply of waterll is connected and led into the tank through a valve 12 controlled by a float 13. These parts are arranged so that the normal level of the water in th'e'tankilo will i be just above the level. of the pump inlet so v to the pla'ce where itis desired to vent the air.-

that the pump always will have/the proper amount of make-up or operating water.

The small surplus of water'that passes over to the pump from this source is fed along into the ejector and passes out with the sew- {LUG ?To provide for the venting of the ejector l arrange a vent valve G in the pipe E. This vent'valve has a suitable casing 14:. A bushing or cylindrical shell 15 having ports or slots extending partway of its length has a valve seat 16 at its top. A plate 17 is attached to the casing 14 by screws 18 and holds these parts in position.

A vent pipe 19 is connected to this plate 17 1 This pipe- 19 may connect to the air inlet of the pump or separately to the atmosphere or Sliding inside of the cylindrical shell 15 is a valve 20, which has a rubber or bearing face 21, which can s'eaton the valve. seat 16, the bearing face 21 being held to the valve by screw 22. The valve has a depending stem 23,.a bolt-head or collar 24 being formed on the lower end thereof.

A piston 25 is loosely fitted on the stem 23. This piston may have small 1 slots or grooves 26in its upper face,,as illustrated in Fig. 7, so that it will not stick tofthe lower side of the valve 20. The valve 20"and the piston 25 preferablyare made out of nonoXidizable metal. A cap'27 is threaded in the-bottom part 'of the casing and contains-a rubber or soft material cushion 28 against which the head 24 can strike.

When the pump is in operation and air. is beingforced-into the ejector-or 'pot A, as

shown in Fig. 1, the pressure of the air'on flow of air through the vent valve stops and the piston 25 dropsto the position shown in Fig.1 4, closing the passage betweenthe coinpressor and the sewage ejector. The air in the compressor is relieved of pressure by the water falling tothe bottom of the casing,

allowing the inlet andoutl-et ports to connect to the atmosphere. This relieves thebott'om of piston 25 of pressure, and the pressurein in the and the head.

the sewage ejector pot is communicated directly on top of this piston, which has a greater area than the bearing face 21 of the valve 22. This causes the piston 25, carrying with it valve 22, to drop to the position shown in Fig. 2 and Fig. 5,- whereby the air pot can escape out through the vent pipe19. A

7 It ewillalso be seen that. when the flow of "air into" the potceasesbyth'e stopping of the pump and the piston 25 drops down on the stem 23 of the valve, it will strike on the head 24and this willj ar and-helpreleasethe valve from the valve seat 16. 'This action when it stops and when the back flow of air starts the'venti valve will operate-immediately. The use of the piston incombination with the valve makes a vent valve'which will operate efiiciently in the location shown and by using thesame the priming of the hydroturbine air pump will not interfere with the operation. v

The details herein shown' and described be greatly varied by a' skilled mechanic without departing from the scope of my invention as expressedin the claims;

Having thus described'my invention, what I desire to claim and secure by Letters Patexit is:

'1. An automatically operating vent valve comprising a casing having two openings and a vent opening, a ported cylindrical shell arranged opening cylindrical shell arranged therein, a. valve seat, a valve, and a piston fit-;

said valve. r

2. An automatically operating vent valve, comprising a casing having two openings and avent opening, a ported cylindrical shell arranged therein," a valve seat, a valve having 2. depending stem, and a piston loosepranged on'said stem andfitting in said s e 1. 1

ting in said shell and connected to operate 3. A ven't'val've, comprising a casing having two openings anda vent opening, a port- "ed cylindrical shell arranged therein, a valve seat on top of said shell, a valve fitted in said shell and having a depending stem provided with a head, and a piston fitted in said shell and sliding on said'stem betweenthe valve 4. A Vent valve,. comprising a casing having two openings anda vent opening, a ported cylindrical shell arranged therein, a valve seat on the top of said shell, a valve fitted in said shell and having a depending stem provided with a head, a piston fitted in said shell and sliding on said stem between the valve and head, and a bumper for said head.

5. A vent valve, comprising a casing having two openings and a vent opening, a ported cylindrical shell arranged therein, a valve seat, a valve, and a piston fitting in said shell and connected to operate said valve, the top of the piston being slotted so that it will not stick to the valve.

In testimony whereof I have hereunto affixed my signature.

IRVING C. JENNINGS. 

